A Regular expression object that will be matched against the declaration property name.

// match content property'expr': /content/i

action{function}

The action function is responsible for processing the declaration. It is executed each time a match is found.

'action': function (prop, value, context) { ... }

prop{string}: The CSS property name.

value{string}: The CSS property raw value, Note that comments in the raw value will be replaced by the Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD) � (this is to preserve original formatting and simplify pattern matching).